Siemens Simatic M7-400 Reference Manual page 568

Parameter Sets for Signal Modules
The figure below shows the structure of data record 1 (bytes 4, 5 and 6) for the
parameters of the digital input modules.
You enable a parameter by setting the corresponding bit to "1".
Figure A-2
A-6
7 6 5 4 3 2 1
Byte 4
On falling edge at channel 10
On falling edge at channel 11
On falling edge at channel 12
On falling edge at channel 13
On falling edge at channel 14
On falling edge at channel 15
7 6 5 4 3 2 1
Byte 5
Enable substitute value 1 on channel 2
Enable substitute value 1 on channel 3
Enable substitute value 1 on channel 4
Enable substitute value 1 on channel 5
Enable substitute value 1 on channel 6
Enable substitute value 1 on channel 7
7 6 5 4 3 2 1
Byte 6
Enable substitute value 1 on channel 9
Enable substitute value 1 on channel 10
Enable substitute value 1 on channel 11
Enable substitute value 1 on channel 12
Enable substitute value 1 on channel 13
Enable substitute value 1 on channel 14
Enable substitute value 1 on channel 15
*) Only in 6ES7 421-7BH00-0AB0
Data Record 1 for Parameters of the Digital Input Modules
S7-400, M7-400 Programmable Controllers Module Specifications
0
Hardware interrupt
On falling edge at channel 8
On falling edge at channel 9
0
Substitute value *)
Enable substitute value 1 on channel 0
Enable substitute value 1 on channel 1
0
Substitute value *)
Enable substitute value 1 on channel 8
A5E00069467-07